You must have the nvidia-smi tool installed and your NVIDIA GPU(s) must support the tool. Mostly the newer high end models used for AI / ML and Crypto or Pro range, read more about nvidia_smi.

You must enable this plugin as its disabled by default due to minor performance issues.

On some systems when the GPU is idle the nvidia-smi tool unloads and there is added latency again when it is next queried. If you are running GPUs under constant workload this isn’t likely to be an issue.